export const openWindow = (
    url: string,
    opt?: {
        target?: "_self" | "_blank" | string
        noopener?: boolean
        noreferrer?: boolean
    }
) => {
    const { target = "__blank", noopener = true, noreferrer = true } = opt || {};
    const feature: string[] = [];

    noopener && feature.push("noopener=yes");
    noreferrer && feature.push("noreferrer=yes");

    window.open(url, target, feature.join(","));
};

/**
 * @description: base64 to blob
 */
export const dataURLtoBlob = (base64Buf: string): Blob => {
    const arr = base64Buf.split(",");
    const typeItem = arr[0];
    const mime = typeItem.match(/:(.*?);/)![1];
    const bstr = window.atob(arr[1]);
    let n = bstr.length;
    const u8arr = new Uint8Array(n);
    while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
    }
    return new Blob([u8arr], { type: mime });
};

/**
 * img url to base64
 * @param url
 */
export const urlToBase64 = (url: string, mineType?: string): Promise<string> => {
    return new Promise((resolve, reject) => {
        let canvas = document.createElement("CANVAS") as Nullable<HTMLCanvasElement>;
        const ctx = canvas!.getContext("2d");

        const img = new Image();
        img.crossOrigin = "";
        img.onload = function() {
            if (!canvas || !ctx) {
                return reject();
            }
            canvas.height = img.height;
            canvas.width = img.width;
            ctx.drawImage(img, 0, 0);
            const dataURL = canvas.toDataURL(mineType || "image/png");
            canvas = null;
            resolve(dataURL);
        };
        img.src = url;
    });
};

/**
 * Download online pictures
 * @param url
 * @param filename
 * @param mime
 * @param bom
 */
export const downloadByOnlineUrl = (
    url: string,
    filename: string,
    mime?: string,
    bom?: BlobPart
) => {
    urlToBase64(url).then((base64) => {
        downloadByBase64(base64, filename, mime, bom);
    });
};

/**
 * Download pictures based on base64
 * @param buf
 * @param filename
 * @param mime
 * @param bom
 */
export const downloadByBase64 = (buf: string, filename: string, mime?: string, bom?: BlobPart) => {
    const base64Buf = dataURLtoBlob(buf);
    downloadByData(base64Buf, filename, mime, bom);
};

/**
 * Download according to the background interface file stream
 * @param {*} data
 * @param {*} filename
 * @param {*} mime
 * @param {*} bom
 */
export const downloadByData = (data: BlobPart, filename: string, mime?: string, bom?: BlobPart) => {
    const blobData = typeof bom !== "undefined" ? [bom, data] : [data];
    const blob = new Blob(blobData, { type: mime || "application/octet-stream" });

    const blobURL = window.URL.createObjectURL(blob);
    const tempLink = document.createElement("a");
    tempLink.style.display = "none";
    tempLink.href = blobURL;
    tempLink.setAttribute("download", filename);
    if (typeof tempLink.download === "undefined") {
        tempLink.setAttribute("target", "_blank");
    }
    document.body.appendChild(tempLink);
    tempLink.click();
    document.body.removeChild(tempLink);
    window.URL.revokeObjectURL(blobURL);
};

/**
 * Download file according to file address
 * @param {*} sUrl
 */
export const downloadByUrl = ({
                                  url,
                                  target = "_blank",
                                  fileName
                              }: {
    url: string
    target?: "_self" | "_blank"
    fileName?: string
}): boolean => {
    const isChrome = window.navigator.userAgent.toLowerCase().indexOf("chrome") > -1;
    const isSafari = window.navigator.userAgent.toLowerCase().indexOf("safari") > -1;

    if (/(iP)/g.test(window.navigator.userAgent)) {
        console.error("Your browser does not support download!");
        return false;
    }
    if (isChrome || isSafari) {
        const link = document.createElement("a");
        link.href = url;
        link.target = target;

        if (link.download !== undefined) {
            link.download = fileName || url.substring(url.lastIndexOf("/") + 1, url.length);
        }

        if (document.createEvent) {
            const e = document.createEvent("MouseEvents");
            e.initEvent("click", true, true);
            link.dispatchEvent(e);
            return true;
        }
    }
    if (url.indexOf("?") === -1) {
        url += "?download";
    }

    openWindow(url, { target });
    return true;
};
